panic: sbflush_locked on 5.4-p5/i386

[Robert Watson]

On Mon, 8 Aug 2005, Rong-En Fan wrote:

> After upgrading to 5-STABLE (about Aug 6), it works very good. With 
> mpsafenet=1, it can work more than one day without panic. For 5.4-p5, it 
> will panic at most half day or so. This bug seems fixed after 5.4 is 
> released. I'll keep watching this machine. Will let you know if it still 
> have similar panics ;-)

If you can confirm that the problem really is fixed in -STABLE, there are 
two sets of changes that may be relevant:

- There are a number of SACK-related bug fixes in RELENG_5 that are not in
   the RELENG_5_4 branch.

- There are a number of TCP/inpcb-related locking fixes (one in particular
   for IPv6) that are in RELENG_5 but not RELENG_5_4.

We can then try and figure out which change it is that's helping, and get 
that merged to RELENG_5_4 as an errata item.  If you have IPv6 traffic, 
there are some fixes I made a month or two ago that might be particularly 
relevant during connection tear-down.

Robert N M Watson